Device for use in forming concrete conduits



D. N. TRULLINGER ET AL Filed June 2, 1923 Mch H 9 924 DEVICE FOR USE INFCRMINC CONCRETE CoNDUITs Patented lidar. lill, i924.

TIPS] naar @este DANIEL N. TRULLINGER AND HERBERT A. TRULLINGER, OFAURORA, OREGON.

DEVICE FOR USE IN FORCleflllNGf CONCRETE CONDUITS.

Application led June 2,

To all whom t may concern:

Be it known that we, DANinL N. TnUIf LINGER and HERBERT A. TRULLINGER,citizens of the United States, residing at Aurora, in the county ofClackamas and State of Oregon, have invented certain new and usefulImprovements in Devices for Use in Forming Concrete Conduits, of whichthe following is a specification.

Our invention is a form for use in forming concrete conduits and has forits object the provision of a simple and inexpensive device which willbe yfirmly supported while concrete or other cementitious material isbeing placed around it to form a pipe or conduit, and which may bereadily shifted along the ditch as the work progresses to be used in theformation of a second section of pipe. The invention also has for itsobject the provision of simple means whereby the form may be easilycollapsed to permit its withdrawal from a formed pipe section, and alsohas for its object the provision of means whereby the end of the formedsection will be held against crumbling or collapsing while the device isbeing set in position for the formation of a succeeding section. Otherincidental objects of the invention will appear in the course of thefollowing description.

In the drawing:

Figure 1 is a sectional elevation of our improved form showing it inposition at the end of a ditch prior to the deposit of material thereinFig. 2 is a similar view showing a part of a finished pipe section withthe form in position for the production of a second pipe section;

Fig. 3 is an end elevation;

Fig. 4 is a detail sect-ion on the line 4-4 of Fig. 3, and

Fig. 5 is an enlarged detail section on the line 5-5 of Fig. 4.

In the drawing, the reference numeral 1 indicates a ditch or trench inwhich a concrete bipe or conduit is to be laid, and 2 indicates a partof a stand pipe or other structure which is set in the end of the ditchand with which the pipe or conduit is to be connected. This stand pipeis, of course,

rovided in one side with an opening wherey, when the conduit is formed,communication will be established between the conduit and the standpip-e, and in forming 1923. Serial N0. 643,128.

the initial section of the conduit one end of the form is inserted inthis opening, as clearly shown in Fig. l. The form consists primarily ofa sheet metal cylinder 3 formed of a single blank of the properdimensions with its longitudinal edges overlapping, as shown at 4.Within the cylinder adjacent the ends thereof, we arrange heads 5consisting of semi-circular members 6 having their straight edgeportions facing and normally abutting. The circular 0r arcuate edges ofthese sections may be covered with sheet metal, as indicated at 7, toresist wear, and one section is secured at any convenient point to theadjacent portion of the cylinder 3 by any convenient fastening device,as the screw 8. A contractile spring 9 is attached to the two sectionsand bridges the joint between the same, as clearly shown in Fig. 3, sothat the sections are normally held together and the form will be incollapsed condition. Extending between the upper portions of the twosections of the heads is a rocking bar 10 having flattened or camportions 11 adjacent its ends and equipped with a handle 12 of anyconvenient form at its front end. The rocking bar is held againstendwise movement by retainers 13 of any convenient or desired formfitted thereon against the outer faces of the respective heads and theflattened cam portions 11 of the bars fit between and against thestraight edge portions of the sections, as will be readily understood.At the front end of the cylinder or form, we secure, as by pins 17, tothe under side thereof a shoe 14 whereby the said end of the form willbe supported, and this shoe by resting upon the bottom of the ditch ortrench 1 will support the cylinder in such position that the grout orgreen cement may be permitted to reach the bottom of the trench underthe form so that a complete pipe will be produced. We also provideacollar 15 which has an arcuate lower edge of the same radius as theshoe 14, and this collar is slidably fitted about the cylinder 3. Theopening through the collar is preferably slightly greater than the crosssectional area of the cylinder soy that, when the cylinder is collapsed,the collar may be easily slid along the same and the upper portion ofthe collar may be of any desired outline, although it is preferably ofthe rectangular form shown most clearly in Fig. 3, whereby it willconform to the cross section of the ditch or trench and will etfectuallyrestrain the concrete from passing beyond the collar and thereby beingliable to collect in front of the form. @n the front side of this collaror stop plate are mounted the vertically slidable anchor pins 18 whichare adapted to enter the bottom of the ditch and thereby hold the collarwhile the cylinder is drawn forward.

The manner of using the device will, it is thought, be readilyunderstood. initially, the form is arranged with one end engaged in theopening in the stand pipe 2, as previously stated and as shown in Fig.1, the collar or stop plate 15 being disposed adjacent the front end ofthe f rin and against the shoe 14. Ylhe green conc-rete or other plasticmixture is then poured into the ditch between the stand pipe and thecollar or stop plate 15 and is tamped down in the usual manner ofworking concrete, the result being that a pipe, as shown at 16, will beproduced around the form or mold. l/Vhen the form is thus disposed, theroching bar 1() is turned so that the edges of'its flattened portions 11will be presented to the straight or diametric edges of the headsections, and the said sections will be spread apart, as shown in Fig.5, thereby firmly supporting the cylinder 3 in its expanded position.`When the concrete has been partly set, the rocking bar is given aquarter turn so that the sides of the cams or flattened portions 11 willbe presented to the straight edges of the head sections, whereupon thesprings 9 will at once pull the said sections together, as shown in Fig.3, and the cylinder 3 will collapse so that it will be loosened from theformed pipe section and may be then withdrawn to the position shown in Fig. 2.( The cylinder will not be entirely withdrawn from the formed pipesection but its rear end will be left within the saine so as to supportit against collapse and while the cylinder is being thus shifted alongthe ditch, the collar or stop plate 15 will remain against the end ofthe formed section Aso that crumbling thereof will be very effectuallyprevented. By the time the cylinder has lbeen properly positioned andagain eX- panded, the end of the formed section will be suficiently setto permit the collar to be moved away from the saine, whereupon theanchor pins 18 are raised and the collar is shifted to the front end ofthe cylinder and anchored, as indicated by the dotted lines in Fig. 2,after which the operation of pouring and tamping the concrete may berepe'ated.

It will be readily noted that we have provided an exceedingly simpledevice whereby concrete conduits or pipes may be easily formed in theditch in which they are to be placed and by the use of which acontinuous Licence.

uninterrupted monolithic conduit will be produced. The rocking spreaderbar will act directly upon the sections of the cylinder supporting headswhich will respond quickly to the movement of the said bar or rod, andthe edges of the split cylinder will overlap sufficiently to avoid theformation of an open joint even when the cylinder is fully expanded. Theshoe 14e may be secured' to the end of the cylinder by any con-A venientor preferred fastening devices, and these devices are preferablyextended through the wall of the cylinder to present eyes 1T ywhich maybe engaged by any convenient forni of tool whereby the mold may be drawnalong the ditch to its successive working positions.

`Having thus described the invention, what is claimed asnew is:

1. A device for the purpose set forth comprising a longitudinally splitcylinder having its side edges overlapping, divided heads fitted withinthe cylinder adjacent the ends thereof, means for holding the members ofthe heads normally together, and a spreader bar passing between themembersof the heads and engagingV the opposed edges of the same.

2. A device for the purpose set forth comprising a longitudinally splitcylinder having its edges overlapping, head members disposed within thecylinder adjacent the ends of the saine and having their diainetricedges normally abutting, a spreader bar eX- tcnding longitudinally ofthe cylinder and having cam portions at its ends fitting between theopposed edges of the head sections whereby to spread the said sectionsor permit them to abut, and a contractile spring attached to thesections of the heads and bridging the joint between the same.

3. A device for the purpose set forth comprising a split cylinder, meansfor collapsing or expanding said cylinder, a shoe secured to the underside of the cylinder at the front end thereof, and a collar slidably Yfitted upon the cylinder.

e. A device for the purpose set forth comprising a longitudinally splitcylinder, means for expanding or contracting the cylinner, and a shoesecured to the under side of the cylinder at the front end thereofwhereby to support the cylinder in spaced relation to the bottom of aditch, the rear end of the cylinder being supported by a previouslyformed pipe section.

5.1i device for the purpose set forth comprising a longitudinally splitcylinder, means for expanding and collapsing said cylinder, means forsupporting the front end of the cylinder, and a collar slidably mountedupon the cylinder and having its loi er edge portion adapted to restupon the bottom of the ditch in which the cylinder is placed.

6. A device for the purpose set forth comprising a longitudinally splitcylinder, means "for expanding and collapsing said cylinder, means forsupporting the front end of the cylinder, a collar slidaoly mounted uponthe Cylinder and having its lower edge portion adapted to rest upon thebottom of In testimony whereof We affix oui` signa- 10 tures.

HERBERT A. TRULUNGER. [L S.]

DANIEL N. TRULLINGER.

